<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>栅格系统</title>
    <link rel="stylesheet" href="dist/css/bootstrap.css">
    <link rel="stylesheet" href="dist/css/bootstrap-theme.css">
    <script src="js/jquery-3.4.1.min.js"></script>
    <script src="dist/js/bootstrap.js"></script>
    <style>
        .first-div{
             border: 1px solid #f63;
         }
        .second-div{
            border: 1px solid #000000;
        }
    </style>
</head>
<body>

    <div class="container">
        <div class="row first-div">
            <div class="col-md-1">占1个列</div>
            <div class="col-md-2">占2个列</div>
            <div class="col-md-3">占3个列</div>
            <div class="col-md-4">占4个列</div>
            <div class="col-md-2">占2个列</div>
        </div>


        <div class="row first-div">
            <div class="col-md-6">占6个列</div>
            <div class="col-md-4">占4个列</div>
            <div class="col-md-2">占2个列</div>
        </div>

        <div class="row first-div">
            <div class="col-md-4">占4个列</div>
            <div class="col-lmd-2 col-md-offset-4">占2个列</div>
        </div>
        <div class="row first-div">
            <div class="col-md-4 second-div">
                <div class="col-md-4">占4个列</div>
                <div class="col-md-4">占4个列</div>
                <div class="col-md-4">占4个列</div>
            </div>
            <div class="col-lmd-2 col-md-offset-10">占2个列</div>
        </div>
    </div>

    <s>This line of text is meant to be treated as no longer accurate.</s>

</body>
</html>